Every Vista DVD includes the ability to install any edition of Vista without a product key. When you install without a product key, you get an automatic 30 day evaluation period.
Right-click on the computer icon on the start menu, you’ll see the basic system information window, and you’ll also see the amount of days you have left to activate:
Start a command prompt as Administrator.
And issue this command:
slmgr -rearm
Reboot for the change to take effect, and voila, you have 30 more days.
You can only extend three times, so the total grace period for a Vista evaluation is 120 days.
Right-click on the computer icon on the start menu, you’ll see the basic system information window, and you’ll also see the amount of days you have left to activate:
Start a command prompt as Administrator.
And issue this command:
slmgr -rearm
Reboot for the change to take effect, and voila, you have 30 more days.
You can only extend three times, so the total grace period for a Vista evaluation is 120 days.




